Manufacture of tubes.



O. BRIEDE.

MANUFACTURE OF TUBES.

APPLIOATION FILED SEPT. 7, 1905.

91 4,332. Patented Mar. 2, 1909 wwmzssss: I i

INVENTOR improvement; Fig. 1

. T @FFIQE.

o'r'ro BRiEDE, or BENRATH, GERMANY.

miscreants or 'rUBns.

' specification of Letters l atent.

Patented March 2, 1909;

Application fiiedSepteinb'er 7', 1996-. Serial No. 277,395.

To all whom it may concern:

Be it known that I, Orro'Bnrnnn, residing at Benrath, inthe Province oi the Rhine and Kingdom of Prussia, Germany, a citizen of the Kingdom of Prussia and Empire of Germany, have invented or discovered certain new and useful Improvements in the Mann facture of Tubes, of which improvements the followin is a specification.

The o bject of the present inventimr is to prevent the adherence of the billet to a mandrel in the production of'thin walled tubes by the pushing of one side of the billet away from the mandrel during the reducing and elongating action on the opposite side of the billet.

In the accompanying drawing forming a part of this specification, Figure 1 is a sectional view of a train of rolls embodying my is also a sectional view of said rolls but in a plane at an angle of 90 from the section shown in Fig. 1. Fig. 2 illustrates the arrangement of the rolls. Figs. 3 and 4 are detail views illustrating the sizes of the grooves in the rolls relative to the billet operated on and also illustrating the action of the rolls on the billet.

In the practice of my invention a series of stands or pairs A. B. C. of rolls 1 1 2 2 3 3 etc., arranged for. continuous action, t. e. at such a distance apart that the billet will be caught by one pair of rolls before it is freed from the preceding pair. Alternate rolls are arranged with their axes at an angle, preferably a right angle to the axes of the receding pairof rolls as shown in Fig. 2. he rolls of each pair or stand are so mounted in their housings that the points of bearings 4 of the rolls on the billet will not be in a plane passing through the axes of the rolls, but are so arranged, one somewhat in advance of the other that planes passing through the axes of the rolls and at right angles to the line of feed of the billet, will be parallel to each other but will not coincide, as shown in Figs. 1 and 2. One roll of each pair should be arran ed in advance of the other roll, to permit of the metal being displaced by the first roll not only along the mandrel but also transverse of the mandrel.

By reference to Fig. 1 it will be seen that by the action of the roll 1* which has a bite or bearing on the billet in the rear of the bite or bearing of the roll 1*, the billet is not only elongated but also enlarged transversely, and-that in consequence of this transverse enlargement the portion of the wall of the billet 0 osite that on which the roll 1 bearsand in t 'e rear of the bite or bearing of theroll 1", is forced away from the mandrel as indicated at a. The roll 3 which has. its axis parallel with the axes of the rolls of the stand or pair A,- will operate in the billet at a point diametrically opposite the point of hearing or bite of the roll 1, 'but further along the billet, and will produce an elon a' tion and transverse enlargement of the bil et. As the roll 3 will prevent an extension 0. such enlargement forward, the portion of the wall of the billet on the side opposite that acted on by the roll 3* and in front of the roll 3 will be forced out of contact with the mandrel as indicated at a.

While for urpose of illustration the several lateral isplacements (1., 6., 0., etc. of the walls of the billet, are shown in Fig. 1 as occurring along two diametrically op osite sides of the billet and mandrel, the en argements or displacements b and c effected by the rolls 2* and 2 will be ninety instead of one hundred and eighty degrees from the displacements or enlargements effected by the rolls 1 and 3 as the rolls 2 and 2 have their axes at right angles to the axes of the rolls 1*, 1 and 3 3 In order to prevent the formation of fins the grooves in the several rolls are made of a depth greater than half the diameter of the billet at the points where the rolls operate.

In order to prevent excessive springing of the mandrel by reason of the points of bearing or bite of the rolls of each pair being out of line, the points of bite of the rolls of each pair should be separated only sufiiciently to permit of the necessary enlargement and displacement of the walls of the billet.

It will be seen by reference to Figs. 3 and 4 that an oval shape is imparted by the rolls which have their bite or bearing out of line transversely with the other rolls, hence it is necessary to bring the pipe to proper shape by a pair of rolls having their axes in a common plane. It is referred that this finishing pair of rolls, w ich may be reducing rolls, should form a part of the continuous mill as shown at 5 in Fig. 2.

It is characteristic of my improvement that each of the rolls while producing an bites or bearings of the elongation of a portion of the wall of the the elongation and billet.

having their axes pendent of the mandrel can take place without material friction between the mandrel I claim herein as my invention:

1. A mill for rolling hollow billets having I in combination a series of rolls arranged at different points around the line of movement of the billet. and ada ted to have successive reducing actions on t e billet, each roll having its axis in a plane at right angles to the line of movement of the billet and outside of theplanes passing through the axes of the other rolls, and a mandrel extending between the members of each pair of rolls.

2. A mill for rolling hollow billets having in combination a series of pairs of reducing rolls adapted to have successive reducing actions on the billet, successive pairs of'rolls at right angles to the axes of the preceding pair, and the rolls of each pair having their axes in different planes at line ofmovement of the rolls, and a mandrel exright angles to the billet through the tending of rolls.

3. A mill forrolling hollow billets having in combination a series of grooved reducing rolls arranged around the line of movement of the billet; the sides of the grooves extending beyond a plane coinciding with the axis of the passes, the rolls having their axes in diflerent planes at right angles to the line of movement of'the billet and a mandrel ex? tending between the members of each pair of rolls.

In testimony whereof, have hereunto set my hand.

OTTO BRIEDE. Witnesses Q FRANK HESSENBUOH,

WILLIAM EssENWEIN.

between the members of each pair 

